oil pan gasket

So upon having my oil pan gasket changed, my mechanic informed me that the oil pressure dropped dramatically after a test drive. Before he looks into why, can anyone tell me what it could be? The car has 52K miles on it. I really appreciate the help with this. My 94 GT is almost ready to hit the...

I have a 94 GT with a leaking oil pan gasket. Can I change out the gasket without removing the k-member? Any tips or links are greatly appreciated. I'm a complete newbie to working on a car... but love a challenge and an looking forward to doing this myself.